Control method for inverter power supply system, inverter, storage medium, and program product

Abstract

A control method for an inverter power supply system, an inverter, a computer readable storage medium, and a computer program product. An inverter power supply system (340) comprises a direct-current auxiliary power supply (410) connected to a high-voltage direct-current bus and an alternating-current auxiliary power supply (430) connected to an alternating-current power grid (330), and the direct-current auxiliary power supply (410) and the alternating-current auxiliary power supply (430) supply power to a control system (440) by means of a power supply coupling circuit (420). The method comprises: when the direct-current auxiliary power supply (410) stops operating and an inverter (320) satisfies a preset shutdown condition, the control system (440) outputs a first control signal to turn off the alternating-current auxiliary power supply (430), so that the inverter (320) enters a shutdown state. In this way, the alternating-current auxiliary power supply (430) and the control system (440) can stop operating after the actions such as state detection, inverter potential induced degradation (PID) effect remediation, and inverter program updating and upgrading are completed, the inverter (320) enters the shutdown state, and internal circuits of the inverter (320) stop operating, thereby reducing nighttime power consumption.

Description

Inverter power supply system control method, inverter, storage medium, and program product

[0001] Cross-references to related publications

[0002] This disclosure claims priority to a Chinese patent application filed with the State Intellectual Property Office on January 15, 2024, with application number CN202410057883.3 and invention name “Inverter power supply system control method and inverter, storage medium, and program product.” The entire contents of that application are incorporated by reference into this disclosure. Technical Field

[0003] The embodiments of the present disclosure relate to, but are not limited to, the field of photovoltaic inverters, and in particular to a method for controlling an inverter power supply system, an inverter, a computer-readable storage medium, and a computer program product. Background Art

[0004] In the photovoltaic inverter of a grid-connected photovoltaic power generation system, when light intensity is low at night and the photovoltaic panels stop operating, the photovoltaic inverter enters standby mode. Taking the inverter's Potential Induced Degradation (PID) repair as an example, PID repair is required to maintain PV panel performance during standby mode. Therefore, the photovoltaic inverter's PID repair circuit and control system must continue to operate at night. During this time, the inverter's auxiliary power supply draws power from the AC grid to power the PID repair circuit and control system. The power consumption of this grid-based power supply is considered nighttime standby power consumption. To reduce the inverter's nighttime standby power consumption, a switching device disconnects the auxiliary power supply to the PID repair circuit when the PID repair circuit is not in use, further reducing nighttime power consumption. However, the auxiliary power supply and basic control system remain in operation, generating a certain amount of nighttime power consumption.

[0005] Therefore, there is an urgent need for an inverter power supply system and control method that can reduce nighttime power consumption. Summary of the Invention

[0006] The embodiments of the present disclosure provide an inverter power supply system control method, an inverter, a computer-readable storage medium, and a computer program product, aiming to reduce nighttime power consumption of the inverter power supply system.

[0007] In a first aspect, an embodiment of the present disclosure provides a method for controlling an inverter power supply system, wherein the inverter power supply system includes a DC auxiliary power supply connected to a high-voltage DC bus and an AC auxiliary power supply connected to an AC power grid, wherein the DC auxiliary power supply and the AC auxiliary power supply power a control system through a power coupling circuit, and the method includes: when the DC auxiliary power supply stops working and the inverter meets a preset shutdown condition, the control system outputs a first control signal to shut down the AC auxiliary power supply, and the inverter enters a shutdown state.

[0008] In a second aspect, an embodiment of the present disclosure further provides an inverter, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the inverter power supply system control method as described in the first aspect is implemented.

[0009] In a third aspect, an embodiment of the present disclosure further provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the inverter power supply system control method as described in the first aspect.

[0010] In a fourth aspect, an embodiment of the present disclosure further provides a computer program product, comprising a computer program or computer instructions, characterized in that the computer program or the computer instructions are stored in a computer-readable storage medium, a processor of a computer device reads the computer program or the computer instructions from the computer-readable storage medium, and the processor executes the computer program or the computer instructions, so that the computer device executes the inverter power supply system control method as described in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG1 is a schematic diagram of a power grid power supply system provided by related art;

[0012] FIG2 is a schematic diagram of the structure of an inverter system provided by the related art;

[0013] FIG3 is a schematic diagram of a power grid power supply system provided by an embodiment of the present disclosure;

[0014] FIG4 is a schematic diagram of an inverter power supply system provided in an embodiment of the present disclosure;

[0015] FIG5 is a flow chart of a method for controlling an inverter power supply system according to an embodiment of the present disclosure;

[0016] FIG6 is a flow chart of a method for controlling an inverter power supply system before shutting down an AC auxiliary power supply according to an embodiment of the present disclosure;

[0017] FIG7 is a flow chart of a method for controlling an inverter power supply system provided by an example of the present disclosure;

[0018] FIG8 is a circuit diagram of an AC auxiliary power supply control circuit provided by an example of the present disclosure;

[0019] FIG9 is a working principle diagram of an AC auxiliary power supply control circuit provided by an example of the present disclosure;

[0020] FIG10 is a schematic diagram of an inverter structure provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0021] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present disclosure and are not to be construed as limiting the present disclosure.

[0022] In the description of the present disclosure, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0023] In the description of this disclosure, if there is a description of first or second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0024] In the description of the present disclosure, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present disclosure based on the specific content of the technical solution.

[0025] Referring to Figure 1, a schematic diagram of a power grid system provided by related art is shown. The power grid system includes a photovoltaic module 110, a photovoltaic inverter 120, and an AC grid 130. Photovoltaic module 110 is an energy conversion device capable of converting solar energy into electrical energy. It is composed of multiple solar cells. Common solar cells include silicon-based semiconductor cells, cadmium telluride thin-film cells, copper indium gallium selenide thin-film cells, and dye-sensitized thin-film cells.

[0026] Solar cells convert light energy into electrical energy through the photoelectric or photochemical effect. Their output power depends on factors such as the intensity of solar radiation and the efficiency of the photovoltaic cell. When light strikes a solar cell, the materials within the solar cell generate photogenerated charge carriers, causing electrons to move within the material, thereby generating a direct current. Since AC grid 130 typically uses AC as its primary power supply, in order to inject the DC power generated by the solar cells in photovoltaic module 110 into AC grid 130, a photovoltaic inverter 120 is required to convert the variable DC power generated by photovoltaic module 110 into AC power that matches the frequency of AC grid 130 to meet the electricity needs of households, industry, and commerce.

[0027] With the increasing adoption of photovoltaic power generation, the voltages of photovoltaic modules are increasing. When photovoltaic modules operate at high voltages for extended periods, minute leakage currents may occur between the cover glass, encapsulation materials, and frame. This can lead to charge accumulation on the surface of the photovoltaic cells, reducing the passivation effect of the solar cells on the module's surface and causing a potential-induced degradation (PID) effect. This PID effect can reduce the fill factor, short-circuit current, and open-circuit voltage of the solar cells, impacting the module's luminous efficiency. However, PID is reversible, and repair measures can be taken to restore the performance of the photovoltaic module. A common repair method involves applying a reverse voltage or current to the photovoltaic module through a PID repair circuit to reduce or eliminate the potential difference on the solar cell surface, thereby repairing the PID effect and restoring the module's performance.

[0028] Referring to Figure 2, a diagram of an inverter system structure provided by related art shows that the inverter system structure includes a photovoltaic module 210, a photovoltaic inverter 220, and an AC power grid 230. The photovoltaic inverter 220 includes an auxiliary power supply 221, a control system 222, and a PID repair circuit 223. The auxiliary power supply 221 draws power from the AC power grid 230 and supplies power to downstream loads such as the PID repair circuit 223 and the control system 222. In related art, at night when there is no sunlight, the photovoltaic module 210 stops generating power. At this time, there is essentially no input voltage between the photovoltaic inverter 220 and the photovoltaic module 210, and the photovoltaic inverter 220 enters a standby mode. Although the photovoltaic inverter 220 does not supply power to the AC power grid 230 at night, it can obtain basic control power from the AC power grid 230 to power the control system 222. In addition to basic control power consumption, the photovoltaic inverter also generates other power consumption at night. Taking PID repair as an example, in standby mode, to maintain the performance of photovoltaic module 210, PID repair of photovoltaic module 210 is required via PID repair circuit 223. Therefore, the PID repair circuit 223 and control system 222 of photovoltaic inverter 220 still need to operate at night. The auxiliary power supply 221 of photovoltaic inverter 220 draws power from the AC grid 230 to power the PID repair circuit 223 and control system 222. The power consumption of this grid power is the nighttime standby power consumption of photovoltaic inverter 220. To reduce the nighttime standby power consumption of photovoltaic inverter 220, when the PID repair circuit 223 is not in use, a switching device is used to disconnect the auxiliary power supply 221 from the PID repair circuit 223, further reducing nighttime power consumption. However, the auxiliary power supply 221 and basic control system 222 are still in operation, and a certain amount of nighttime power consumption will still occur.

[0029] In order to further reduce the nighttime power consumption of the inverter, the embodiment of the present disclosure provides an inverter power supply system control method, which is applied to the inverter power supply system. The inverter power supply system includes a DC auxiliary power supply connected to the high-voltage DC bus and an AC auxiliary power supply connected to the AC power grid. The DC auxiliary power supply and the AC auxiliary power supply supply power the control system through a power coupling circuit. When the DC auxiliary power supply stops working and the inverter meets the preset shutdown conditions, the control system can output a first control signal to turn off the AC auxiliary power supply, so that the inverter enters the shutdown state. In the above manner, the AC auxiliary power supply and the control system can stop working after the state detection, the inverter potential induced decay PID effect repair, the inverter program update and upgrade, and other actions are completed. The inverter enters the shutdown state, and the internal circuits of the inverter all stop working, thereby reducing the nighttime power consumption.

[0030] The embodiments of the present disclosure are further described below with reference to the accompanying drawings.

[0031] Referring to Figure 3, Figure 3 is a grid power supply system provided by an embodiment of the present disclosure, including a photovoltaic module 310, an inverter 320, and an AC grid 330. The photovoltaic module 310 is connected to the inverter 320 through a high-voltage DC bus, and the inverter 320 is connected to the AC grid 330, wherein the inverter 320 includes an inverter power supply system 340.

[0032] Referring to Figure 4, Figure 4 shows an inverter power supply system 340 provided in an embodiment of the present disclosure. The inverter power supply system 340 includes a DC auxiliary power supply 410 connected to a high-voltage DC bus and an AC auxiliary power supply 430 connected to an AC power grid. The DC auxiliary power supply 410 and the AC auxiliary power supply 430 supply power to a control system 440 through a power coupling circuit 420.

[0033] 5 , which is a flow chart of a control method for an inverter power supply system 340 provided in an embodiment of the present disclosure, including but not limited to the following steps:

[0034] Step S5010 : When the DC auxiliary power supply 410 stops working and the inverter 320 meets a preset shutdown condition, the control system 440 outputs a first control signal to shut down the AC auxiliary power supply 430 .

[0035] Step S5020: The inverter 320 enters the shutdown state.

[0036] In one embodiment, the preset closing condition includes at least one of the following:

[0037] The status monitoring of inverter 320 is completed, the potential induced decay PID effect of inverter 320 is repaired, and the program update and upgrade of inverter 320 is completed.

[0038] When the DC auxiliary power supply 410 stops operating and the inverter 320 enters standby mode, the AC auxiliary power supply 430 draws power from the AC grid 330 and supplies power to the control system 440 via the power coupling circuit 420. At this point, the AC auxiliary power supply 430 and the control system 440 remain in operation, generating nighttime power consumption. In this embodiment, after the DC auxiliary power supply 410 stops operating and pre-set shutdown conditions, such as completion of status monitoring, PID effect repair, and inverter program upgrade, are met, the control system 440 outputs a first control signal to shut down the AC auxiliary power supply, thereby causing the AC auxiliary power supply 430 to cease operation. Due to the loss of power from the AC auxiliary power supply 430, the control system 440 also ceases operation, and the inverter 320 enters a shutdown state. At this point, all internal circuits of the inverter 320 cease operation, reducing the inverter 320's nighttime power consumption.

[0039] In one embodiment, the inverter 320 performs status monitoring via a status detection system. When a fault is detected, it is reported to the cloud server via the communication system. It is understood that at night, since the PV panels 310 are not operating and generating electricity, the inverter 320 is in standby mode, and the likelihood of a fault or alarm is low. Therefore, continuous status monitoring of the inverter 320 is not required. Once the inverter 320 status monitoring is complete and no faults or alarms are detected, monitoring can be discontinued.

[0040] In one embodiment, the inverter 320 establishes communication with the cloud server via a communication system to update the inverter 320 program. It will be appreciated that this embodiment uses the communication system to update the inverter 320 program version, thereby updating the inverter 320's functionality or remediating existing program issues. Furthermore, performing program updates while the DC auxiliary power supply 410 is stopped can prevent malfunctions caused by program updates during the inverter 320's operation.

[0041] In one embodiment, the inverter 320 applies a reverse voltage or current to the photovoltaic assembly 310 through a PID repair circuit to repair the PID effect.

[0042] In one embodiment, the preset shutdown conditions include: completion of status monitoring of the inverter 320 , completion of repair of the potential induced decay (PID) effect of the inverter 320 , and completion of updating and upgrading of the inverter 320 program.

[0043] In one embodiment, the preset shutdown condition can be set on the cloud server and sent to the inverter 320 for execution through the communication system.

[0044] In one embodiment, the control system 440 includes a system control chip 490 and an AC auxiliary power supply control circuit 450. The system control chip 490 is connected to the AC auxiliary power supply through the AC auxiliary power supply control circuit 450. The control system 440 outputs a first control signal to turn off the AC auxiliary power supply, including: the system control chip 490 outputs the first control signal to the AC auxiliary power supply control circuit 450; the AC auxiliary power supply control circuit 450 turns off the AC auxiliary power supply 430 according to the first control signal.

[0045] In one embodiment, the AC auxiliary power control circuit 450 includes an AC auxiliary power control chip, and the AC auxiliary power control chip includes an AC auxiliary power control pin;

[0046] The AC auxiliary power supply control circuit 450 turns off the AC auxiliary power supply 430 according to the first control signal, including:

[0047] When the first control signal is at a low level, the AC auxiliary power control pin is pulled down to a low level, the AC auxiliary power control chip is turned off, and the AC auxiliary power supply 430 stops working.

[0048] In one embodiment, the AC auxiliary power control pin controls the operating state of the AC auxiliary power control chip. When the AC auxiliary power control pin is low, the AC auxiliary power control chip is turned off, and the AC auxiliary power supply 430 stops operating. Conversely, when the AC auxiliary power control pin is high, the AC auxiliary power control chip is turned on, and the AC auxiliary power supply 430 begins operating.

[0049] In one embodiment, the AC auxiliary power control circuit 450 further includes:

[0050] A first switching tube, a first optocoupler, and a second switching tube;

[0051] The emitter anode of the first optocoupler is connected to the first output terminal of the power coupling circuit, the emitter cathode of the first optocoupler is connected to the first drain of the first switch tube, and the first gate of the first switch tube is connected to the second output terminal of the system control chip 490;

[0052] The receiving end collector of the first optical coupler is connected to the second gate of the second switch tube, the second drain of the second switch tube is connected to the AC auxiliary power supply control pin, and the second source of the second switch tube is grounded;

[0053] In one embodiment, when the first control signal is output at the second output terminal and the first control signal is at a low level, the first switch tube is turned on, the first optocoupler is turned off, and the collector of the receiving end outputs a low level signal, so that the second switch tube is turned on, the AC auxiliary power supply control pin is grounded, and the AC auxiliary power supply control pin is pulled down to a low level.

[0054] In one embodiment, the first gate of the first switching tube and the second gate of the second switching tube are turned on when the voltage level is high and are turned off when the voltage level is low.

[0055] In one embodiment, the first switch tube and the second switch tube are bipolar junction transistors (BJT);

[0056] In one embodiment, the first switch tube and the second switch tube are metal-oxide-semiconductor field-effect transistors (MOSFETs).

[0057] In one embodiment, the collector of the receiving end of the first optocoupler is also connected to the power supply end of the AC auxiliary power supply 430. It is understandable that because the anode of the optocoupler emitter is connected to the output end of the power coupling circuit, and the other side of the optocoupler is connected to the output end of the AC auxiliary power supply, signal transmission through the first optocoupler can achieve electrical isolation between the circuits on both sides.

[0058] It should be noted that the power supply terminal of the AC auxiliary power supply 430 is the supply voltage received by the AC auxiliary power supply 430. In one embodiment, the power supply terminal of the AC auxiliary power supply 430 is a DC voltage generated by rectifying the AC power from the AC power grid 330 through a rectifier. In another feasible embodiment, the DC voltage at the power supply terminal of the AC auxiliary power supply 430 is provided by another DC energy storage battery capable of stable operation. The present embodiment does not limit the source of the DC voltage at the power supply terminal of the AC auxiliary power supply 430.

[0059] In one embodiment, the emitter of the receiving end of the first optocoupler is grounded, and the collector of the receiving end of the first optocoupler is connected to the power supply terminal of the AC auxiliary power supply 430 via a fifth resistor. The first end of the sixth resistor is connected between the collector of the receiving end of the first optocoupler and the fifth resistor, and between the collector of the receiving end of the first optocoupler and the control pin of the AC auxiliary power supply, and the second end of the sixth resistor is grounded. The second gate of the second switching tube is connected between the first end of the sixth resistor and the collector of the receiving end of the first optocoupler. The voltage at the first end of the sixth resistor is the voltage at the second gate of the second switching tube.

[0060] When the first optocoupler is turned on, current flows from the power supply terminal of the AC auxiliary power supply 430 through the fifth resistor and the first optocoupler, and then to ground. At this point, the sixth resistor is short-circuited, and the first terminal of the sixth resistor is at a low level. The input voltage of the second gate of the second switching tube is the same as the voltage of the first terminal of the sixth resistor, both at a low level. The second switching tube is turned off. The AC auxiliary power supply control pin remains high, and the AC auxiliary power supply 430 is activated.

[0061] When the first optocoupler is off, current flows from the power supply terminal of the AC auxiliary power supply 430 through the fifth and sixth resistors to ground. At this point, the sixth and fifth resistors share the voltage at the power supply terminal of the AC auxiliary power supply 430. The first terminal of the sixth resistor is at a high level, and the input voltage of the second gate of the second switching transistor is the same as the voltage at the first terminal of the sixth resistor, both at a high level. The second switching transistor is turned on. The AC auxiliary power supply control pin is pulled low, shutting down the AC auxiliary power supply 430.

[0062] It is understood that even when the inverter 320 enters the shutdown state and the DC auxiliary power supply 410 and the AC auxiliary power supply 430 are turned off, the low-level signal can be maintained without power supply. Therefore, even when both the DC auxiliary power supply 410 and the AC auxiliary power supply 430 are turned off, the control system 440 can still continue to output the low-level first control signal, causing the AC auxiliary power supply 430 to stop operating and maintaining shutdown control over the AC auxiliary power supply 430.

[0063] In one embodiment, the AC auxiliary power control pin includes one of the following conditions:

[0064] COMP pin of chip NCP1380; and

[0065] COMP pin of chip UC3843.

[0066] Referring to Figure 6, Figure 6 is a flow chart of a method for controlling the inverter power supply system 340 before shutting down the AC auxiliary power supply 430, according to an embodiment of the present disclosure. The photovoltaic modules 310 of the inverter 320 are connected to the DC auxiliary power supply 410 via a high-voltage DC bus. Before the control system 440 outputs a control signal to shut down the AC auxiliary power supply 430, the method for controlling the inverter power supply system 340 includes, but is not limited to, steps S6010-S6040:

[0067] Step S6010: detecting the voltage value of the photovoltaic module 310;

[0068] Step S6020: When the voltage value of the photovoltaic module 310 is greater than the first voltage threshold, the DC auxiliary power supply 410 and the AC auxiliary power supply 430 are started, so that the DC auxiliary power supply 410 and the AC auxiliary power supply 430 jointly power the inverter 320, and the inverter 320 enters the working state.

[0069] In one embodiment, when the voltage value of the photovoltaic component 310 is greater than the starting voltage of the DC auxiliary power supply 410, the DC auxiliary power supply 410 and the AC auxiliary power supply 430 are started, so that the DC auxiliary power supply 410 and the AC auxiliary power supply 430 jointly power the inverter 320, and the inverter 320 enters the working state.

[0070] It is understood that when inverter 320 is in operation and not connected to the grid for power generation, DC auxiliary power supply 410 and AC auxiliary power supply 430 respectively power the circuits of inverter 320. Specifically, DC auxiliary power supply 410 and AC auxiliary power supply 430 respectively power the chips in the circuits of inverter 320 to ensure normal operation of the circuits of inverter 320.

[0071] In one embodiment, when it is detected that the voltage value of the photovoltaic assembly 310 of the inverter 320 is greater than the first voltage threshold, the DC auxiliary power supply is started. At this time, the control method of the inverter power supply system 340 further includes:

[0072] The DC auxiliary power supply supplies power to the control system 440 through the power coupling circuit, so that the control system 440 starts; and

[0073] The control system 440 outputs a second control signal to control the AC auxiliary power supply to start 430 .

[0074] In one embodiment, the control method of the inverter power supply system 340 further includes:

[0075] The control system 440 outputs a second control signal to the AC auxiliary power control circuit 450; and

[0076] The AC auxiliary power supply control circuit 450 starts the AC auxiliary power supply 430 according to the second control signal.

[0077] In one embodiment, the second control signal is a high level signal.

[0078] It is understood that at night, when the inverter 320 is in the off state, the control system 440 cannot receive power because both the DC auxiliary power supply 410 and the AC auxiliary power supply 430 are in the off state. However, the control system 440 still outputs a low-level signal to shut down the AC auxiliary power supply. When the voltage of the PV module 310 rises to the startup voltage of the DC auxiliary power supply 410 of the inverter 320, the DC auxiliary power supply 410 starts up, supplies power to the control system 440 through the power coupling circuit 420, and starts up the control system 440. The control system 440 then outputs a high-level second control signal to start the AC auxiliary power supply 430.

[0079] In one embodiment, when the DC auxiliary power supply 410 is started, the control system 440 and the load 470 after the power coupling circuit are powered by the DC auxiliary power supply 410 through the power coupling circuit 420 .

[0080] In one embodiment, when the DC auxiliary power supply 410 stops working, the control system 440 and the load 470 after the power coupling circuit are powered by the AC auxiliary power supply 430 through the power coupling circuit 420 .

[0081] It is understood that during the day, when photovoltaic panels 310 generate electricity, control system 440 uses the electricity generated by photovoltaic panels 310 for power supply. At night or when there is insufficient sunlight, control system 440 switches to using electricity from AC grid 320 for power supply. This approach maximizes the use of solar renewable energy, reduces dependence on the AC grid, and ensures the reliability and stability of inverter power supply system 340.

[0082] Step S6030: When the voltage value of the photovoltaic assembly 310 is greater than the second voltage threshold, the inverter 320 performs a self-check and enters a power generation state after the self-check.

[0083] In one embodiment, when the voltage value of the photovoltaic assembly 310 is greater than the starting voltage of the inverter, the inverter 320 performs a self-test and enters a power generation state after the self-test.

[0084] In one embodiment, the inverter 320 performs a self-test, which includes at least one of the following:

[0085] The inverter 320 performs light intensity detection;

[0086] The inverter 320 performs relay status detection;

[0087] The inverter 320 performs insulation resistance detection;

[0088] The inverter 320 performs DC arc detection.

[0089] In one embodiment, the inverter 320 detects light intensity using a light sensor or other photosensor to determine whether the photovoltaic assembly 310 has sufficient solar radiation to generate a sufficiently large voltage, thereby activating the inverter 320. When the inverter 320 detects insufficient light intensity, the inverter 320 delays entering the operating state or the power generation state.

[0090] In one embodiment, when the light intensity is below a first light threshold, the control system 440 is powered by the AC auxiliary power supply 430 via the power coupling circuit 420. It will be appreciated that, generally during daytime operation of the inverter, the control system 440 is powered by the DC auxiliary power supply 410. However, during cloudy weather, the voltage generated by the photovoltaic module 310 may decrease, potentially falling below the minimum operating voltage of the DC auxiliary power supply, causing the DC auxiliary power supply 410 to interrupt its power supply to the control system 440, thereby impacting the normal operation of the inverter power supply system 340. In this case, a light sensor detects light intensity and issues a warning in advance of low voltage generated by the photovoltaic module 310. When the light intensity falls below the first light threshold, the control system 440 is switched from the DC auxiliary power supply 410 to the AC auxiliary power supply 430 in advance. The AC auxiliary power supply 430 then supplies power to the control system 420 via the power coupling circuit 420. This ensures that even when the voltage of the photovoltaic module 310 falls below the minimum operating voltage of the DC auxiliary power supply, the inverter's control system 440 remains operational.

[0091] In one embodiment, when the light intensity is greater than a second light threshold, the control system 440 is powered by the DC auxiliary power supply 430 through the power coupling circuit 420. The second light threshold is greater than the first light threshold.

[0092] In one embodiment, inverter 320 detects relay status by monitoring current changes in the relay circuit. When the relay is stuck or malfunctioning, the actual current in the circuit may differ significantly from the expected current. The inverter can set an expected current threshold and compare the actual current with the expected current threshold to determine whether the relay is functioning properly.

[0093] In one embodiment, the inverter 320 detects the relay status by monitoring the voltage change in the relay circuit or monitoring the opening and closing time of the relay.

[0094] In one embodiment, the inverter 320 detects the insulation resistance using an insulation resistance detection device.

[0095] In one embodiment, the inverter 320 detects whether a DC arc exists in the circuit through an arc sensor, thereby detecting the presence of an arc fault early.

[0096] Step S6040: When the voltage value of the PV module 310 is less than the third voltage threshold, the DC auxiliary power supply 410 stops working, so that the inverter 320 is powered only by the AC auxiliary power supply 430, and the inverter 320 enters the standby state.

[0097] In one embodiment, when the voltage of the PV module 310 is lower than the minimum operating voltage of the DC auxiliary power supply 410, the DC auxiliary power supply 410 stops working, so that the inverter 320 is powered only by the AC auxiliary power supply 430, and the inverter 320 enters a standby state.

[0098] In one embodiment, when the voltage of the PV module 310 is lower than the minimum operating voltage of the inverter 320 , the DC auxiliary power supply 410 stops working, so that the inverter 320 is powered only by the AC auxiliary power supply 430 , and the inverter 320 enters a standby state.

[0099] In one embodiment, the minimum operating voltage of the inverter 320 is higher than the minimum operating voltage of the DC auxiliary power supply 410. When the voltage of the PV module 310 falls below the minimum operating voltage of the inverter 320, the inverter 320 stops generating electricity and disconnects from the grid, stopping injecting power into the AC grid 320.

[0100] It is understood that although the inverter 320 is not generating power at this time, the DC auxiliary power supply 410 is still in operation, supplying power to the power supply system 440 via the power coupling circuit. When the voltage of the PV module 310 continues to decrease until it falls below the minimum operating voltage of the DC auxiliary power supply 410, the DC auxiliary power supply 410 stops operating and the inverter 320 enters a standby state.

[0101] In one embodiment, a DC auxiliary power supply 410 is connected to a DC auxiliary power supply downstream load 460. The DC auxiliary power supply 410 draws power from the PV panels 310 via a high-voltage DC bus to power the DC auxiliary power supply downstream load 460. The DC auxiliary power supply downstream load 460 includes circuitry that operates only when the inverter 320 is operating.

[0102] Exemplarily, the DC auxiliary power supply downstream load 460 includes a drive circuit, a fan circuit, a relay circuit, and other circuits that only operate when the inverter 320 is in operation. The drive circuit is used to provide appropriate voltage and current signals so that the power switch tube can be quickly turned on and off, and ensure that it operates within the appropriate voltage and current range. The power switch tube plays a key role in converting DC power into AC power, and its switching state needs to be controlled by the drive circuit to achieve normal operation of the inverter 320. The inverter 320 will generate a certain amount of heat during operation, and the fan circuit is used to control and drive the fan in the inverter 320 to ensure heat dissipation of the inverter 320. The relay circuit is used to control and switch the circuits or loads in the inverter 320.

[0103] In one embodiment, the DC auxiliary source post-stage load 460 includes a circuit that operates only when the inverter 320 is in a power generation state.

[0104] In one embodiment, the DC auxiliary source post-stage load 460 includes a circuit that operates only when the inverter 320 is in an operating state and a power generation state.

[0105] It will be appreciated that in this embodiment, since the DC auxiliary power supply downstream load 460 only includes circuits that operate when the inverter 320 is operating, when the voltage of the PV module 310 falls below the minimum operating voltage of the DC auxiliary power supply 410, the inverter 320 stops generating electricity, the DC auxiliary power supply 410 also stops operating, and the DC auxiliary power supply downstream load 460 associated with the operation of the inverter 320 also stops operating. This avoids unnecessary power consumption of the DC auxiliary power supply downstream load 460, such as the drive circuit, fan circuit, and relay circuit, when the inverter 320 is not operating, thereby saving energy. Furthermore, stopping the DC auxiliary power supply 410 at night can reduce the operating time and load of the DC auxiliary power supply 410, reduce wear and aging of the DC auxiliary power supply 410, and extend its service life. When the voltage of the PV module 310 falls below the minimum operating voltage of the DC auxiliary power supply 410 at night, the circuits that operate when the inverter 320 is operating also stop operating along with the DC auxiliary power supply 410. This also prevents unstable operation of the circuits under insufficient voltage conditions, thereby improving the reliability and stability of the inverter 320.

[0106] In one embodiment, the AC auxiliary power supply 430 is connected to a downstream load 480. The AC auxiliary power supply 430 draws power from the AC grid 330 to supply the downstream load 480. The downstream load 480 includes circuitry that operates only when the inverter 320 is in the standby state.

[0107] Exemplarily, the AC auxiliary power supply subsequent-stage load 480 includes a PID repair circuit and other circuits that only operate when the inverter 320 is in a standby state.

[0108] In one embodiment, the output branches of the DC auxiliary power supply 410 and the AC auxiliary power supply 430 are coupled together via a power coupling circuit 420. The power coupling circuit 420 is connected to a load 470 downstream of the power coupling circuit. The DC auxiliary power supply 410 and the AC auxiliary power supply 430 jointly supply power to the load 470 downstream of the power coupling circuit via the power coupling circuit 420.

[0109] In one embodiment, the post-stage load 470 of the power coupling circuit includes circuits that need to work in both the running state and the standby state.

[0110] Exemplarily, the post-stage load 470 of the power coupling circuit includes circuits such as a communication system and a status detection system that need to work in both the running state and the standby state.

[0111] When light levels are insufficient at night, the photovoltaic panels 310 may not provide sufficient power to activate the DC auxiliary power supply 410. In this embodiment, the downstream load 470 and control system 440 of the power coupling circuit are powered by both the DC auxiliary power supply 410 and the AC auxiliary power supply 430 through the power coupling circuit 420. Even in the event of insufficient light and a shutdown of the DC auxiliary power supply 410, the AC auxiliary power supply 430 can take over, allowing the control system 440 to continue operating without being limited by the voltage of the DC auxiliary power supply 410. Furthermore, if a power system accident or disturbance causes a low voltage ride-through (LVRT) in the AC grid, affecting the AC grid 330's power supply to the AC auxiliary power supply 430, the DC auxiliary power supply 410 can take over, ensuring the operation of the downstream load 470 and control system 440. The DC auxiliary power supply 410 and the AC auxiliary power supply 430 jointly provide reliable power to the inverter 320, further improving the reliability and stability of the inverter 320. In addition, the embodiment of the present disclosure can achieve load balancing, improve circuit utilization efficiency and system controllability by connecting loads in different working states to the DC auxiliary power supply post-stage load 460, the power coupling circuit post-stage load 470, and the AC auxiliary power supply post-stage load 480 respectively.

[0112] In the disclosed embodiment, when the photovoltaic module 310 is less than the third threshold, the inverter 320 is no longer capable of generating electricity, the DC auxiliary power supply 410 stops operating, and the DC auxiliary power supply downstream load 460, which is only enabled when the inverter 320 is operating, also stops operating. This can reduce unnecessary power consumption of the DC auxiliary power supply downstream load 460 when the photovoltaic module 310 is no longer capable of generating electricity. At the same time, at this time, the inverter 320 is powered only by the AC auxiliary power supply 430, which is powered by the AC power grid 320. Therefore, even when the DC auxiliary power supply 410 stops operating, the control system 440 is powered by the AC auxiliary power supply 430 through the power coupling circuit 420 and can still operate normally.

[0113] In one embodiment, the second voltage threshold is greater than the first voltage threshold.

[0114] For example, in the absence of sunlight at night, the voltage of the PV module 310 is lower than the startup voltage of the DC auxiliary power supply 410 of the inverter 320, and the inverter 320 is in a shutdown state. During the day, as the light intensity increases, when the voltage of the PV module 310 exceeds the startup voltage of the DC auxiliary power supply 410 of the inverter 320, that is, exceeds the first threshold, the PV module 310 supplies power to the DC auxiliary power supply via the high-voltage DC bus. The DC auxiliary power supply 410 starts and supplies power to the DC auxiliary power supply downstream load 460. The DC auxiliary power supply downstream load circuit 460 operates, and the inverter 320 enters an operating state. It is understandable that at this time, the inverter 320 does not begin generating electricity. Instead, it prepares for the subsequent self-test of the inverter 320 and the start of power generation, pre-starting the circuit. Before the voltage of the photovoltaic module 310 meets the inverter's startup voltage, the DC auxiliary power supply 410 is turned on, and the downstream load 460 of the DC auxiliary power supply enters the operating state in advance. This can save the startup preparation time of the inverter 320 for grid-connected power generation and enable the inverter 320 to enter the power generation state more quickly. As the light intensity continues to increase, the voltage of the photovoltaic module 310 rises to the inverter 320's startup voltage, that is, when it exceeds the second threshold, the inverter 320 enters a self-test to detect whether the operation of each circuit is normal. After the self-test is completed, the inverter 320 enters the power generation state. By using the inverter 320 self-test to detect the operation of each circuit, it can ensure that each circuit is operating normally before the inverter enters the grid-connected power generation state, thereby improving the reliability and stability of the inverter power supply system 340.

[0115] In one embodiment, the second voltage threshold is equal to the first voltage threshold.

[0116] It is understandable that when the voltage value of the photovoltaic module 310 reaches the starting voltage of the inverter 320, the DC auxiliary power supply 410 of the inverter 320 is started, the inverter 320 performs a self-test, and enters the power generation state after the self-test.

[0117] Through this embodiment, the AC auxiliary power supply 430 and the control system 440 can stop working after completing actions such as status detection, inverter potential induced decay PID effect repair, and inverter program update and upgrade. The inverter 320 enters the shutdown state, and all internal circuits of the inverter 320 stop working, thereby reducing power consumption at night.

[0118] The inverter power supply system control method provided by the embodiment of the present disclosure is described in detail below with reference to specific examples.

[0119] FIG7 is a control method for an inverter power supply system provided by an example of the present disclosure. As shown in FIG7 , the method includes but is not limited to steps S1101 to S1111.

[0120] Step S1101: As the light intensity increases during the day, the voltage of the photovoltaic module rises to the starting voltage of the DC auxiliary power supply of the photovoltaic inverter, and the DC auxiliary power supply starts first;

[0121] Step S1102: The DC auxiliary power supply supplies power to the control system through the power coupling circuit, and the control system starts;

[0122] Step S1103: The control system issues an instruction to start the AC auxiliary power supply through the AC auxiliary source control circuit, and all circuits inside the photovoltaic inverter enter the working state;

[0123] Step S1104: As the light intensity continues to increase, the voltage of the photovoltaic module rises to the starting voltage of the photovoltaic inverter, and the inverter performs a self-test;

[0124] Step S1105: If the inverter self-checks and there is no abnormality, the inverter enters the operation state and connects to the grid for power generation;

[0125] Step S1106: At night, as the light intensity decreases, the voltage of the PV modules falls below the minimum operating voltage of the PV inverter. The inverter stops generating electricity and disconnects from the grid, no longer injecting power into the grid.

[0126] Step S1107: As the light intensity further decreases, the voltage of the PV module falls below the minimum operating voltage of the DC auxiliary power supply. The DC auxiliary power supply stops working, the inverter enters a standby state, all downstream loads of the DC auxiliary power supply stop working, and the AC auxiliary power supply supplies power to the control system, communication system, etc. through the power coupling circuit.

[0127] Step S1108: The inverter performs status monitoring, PID repair, program update and upgrade according to needs;

[0128] Step S1109: After the above work is completed, the photovoltaic inverter enters an idle state, and the control system issues an instruction to control the AC auxiliary power supply to stop working through the AC auxiliary source control circuit;

[0129] Step S1110: the AC auxiliary power supply stops working, all circuits of the photovoltaic inverter stop working, and the inverter enters the shutdown state (the power consumption of the inverter at night can be ignored at this time);

[0130] Step S1111: Wait until the next day when the voltage of the photovoltaic module reaches the starting voltage of the DC auxiliary power supply, the DC auxiliary power supply starts, and a new cycle begins.

[0131] This example solution allows the AC auxiliary power supply and control system to stop operating after completing status detection, inverter potential induced decay (PID) effect repair, and inverter program upgrades. The inverter enters a shutdown state, and all internal circuits cease operation, reducing nighttime power consumption. This example also enables rapid startup and power generation of a photovoltaic inverter in its shutdown state.

[0132] Refer to Figure 8, which shows an AC auxiliary power supply control circuit diagram provided by an example of the present disclosure. The AC auxiliary power supply control circuit comprises resistors R1, R2, R3, R4, R5, and R6, capacitors C1 and C2, switches VT1 and VT2, an optocoupler D1, and an AC auxiliary power supply control chip U1. The power supply includes VCC1, a coupled power supply, and its corresponding reference ground GND1; VCC2, a power supply for the AC auxiliary power supply control chip, and its corresponding reference ground GND2. The control signal includes an AC auxiliary power supply control signal CTL1 generated by the control system.

[0133] VCC1 comes from the power coupling circuit, and its reference ground and the control system power supply ground are both GND1. Usually, the control circuit power supply can be selected as VCC1, or other coupling power supply circuits that meet the requirements can be selected as VCC1.

[0134] The control system is powered by the power coupling circuit, which generates an AC auxiliary power control signal CTL1 to control the start and stop of the AC auxiliary power supply. When CTL1 is high, the AC auxiliary power supply starts and operates normally; when CTL1 is low, the AC auxiliary power supply stops.

[0135] D1 is an optocoupler. Since the reference ground GND2 of the high-voltage busbar of the AC auxiliary power supply and the reference ground GND1 of the control system are at different potentials, an optocoupler is required for isolation.

[0136] U1 is the AC auxiliary power supply control chip. It has several pins, including a power supply pin (VCC), a control pin (EN), a ground pin (GND), and other functional pins. The AC auxiliary power supply control chip's power supply circuit draws power from the AC auxiliary power supply's high-voltage bus or output branch. As long as the AC auxiliary power supply is connected to the grid, the VCC pin remains energized, and the voltage on the VCC pin represents the chip's supply voltage (VCC2). The EN pin on the AC auxiliary power supply control chip disables the auxiliary power supply. When the EN pin input signal is low, the AC auxiliary power supply control chip stops oscillating, and the auxiliary power supply stops operating. Conversely, when the EN pin input signal is high, the AC auxiliary power supply starts operating.

[0137] VT1 and VT2 are semiconductor switching devices, which are turned on when the control signal is high and turned off when the control signal is low.

[0138] R1 and R5 are the current-limiting resistors of the optocoupler D1, which limit the current of the primary and secondary sides of the optocoupler to prevent overcurrent damage to the optocoupler; R2 is the discharge resistor of the optocoupler D1. When VT1 is turned off, it prevents the cathode of the primary diode of the optocoupler from accumulating charge to generate high voltage and cause damage to the optocoupler; R3 is the driving resistor of VT1; R4 is the pull-down resistor driven by VT1 to prevent the driver from mis-conducting; C1 is the driving filter capacitor of VT1, which can enhance the anti-interference ability; R6 is the pull-down resistor driven by VT2 to prevent the driver from mis-conducting; C2 is the driving filter capacitor of VT2, which can enhance the anti-interference ability.

[0139] Referring to FIG. 9 , FIG. 9 is a working principle diagram of an AC auxiliary power supply control circuit provided by an example of the present disclosure. The working principle of the AC auxiliary power supply control circuit includes but is not limited to steps S1201 to S1204:

[0140] Step S1201: During the day, when the voltage of the photovoltaic module rises to the starting voltage of the DC auxiliary power supply, the DC auxiliary power supply starts, VCC1 has voltage, the control system starts, and the control system issues an AC auxiliary power supply start-up instruction. CTL1 flips from a low level to a high level, VT1 turns on, current flows through the primary side of the optocoupler D1, VT2 is driven low by the secondary side of the optocoupler, VT2 is turned off, and the EN pin is no longer pulled low by VT2. The AC auxiliary power supply control chip controls the AC auxiliary power supply to start, and the photovoltaic inverter performs self-test and grid-connected operation.

[0141] Step S1201: The inverter is running, the CTL1 signal is always at a high level, VT2 is always in the off state, and the AC auxiliary power supply is working normally;

[0142] Step S1202: When the PV panels stop working at night and the DC auxiliary power supply stops working due to undervoltage, the inverter enters the standby state. At this time, the control system and VCC1 are powered by the AC auxiliary power supply through the coupling circuit. CTL1 maintains a high level, and the AC auxiliary power supply can still operate normally.

[0143] Step S1203: When the inverter enters the idle state, the control system issues an AC auxiliary power shutdown command, CTL1 flips to a low level, the optocoupler D1 is turned off, VCC2 drives VT2 through R5, VT2 is turned on, the EN pin of the AC auxiliary power control chip U1 is pulled down, U1 stops oscillating, the AC auxiliary power stops working, and the inverter enters the shutdown state;

[0144] Step S1204: After the AC auxiliary power supply stops working, the control system and VCC1 both lose power, CTL1 remains at a low level, VCC2 draws power from the grid and therefore still has power, VT2 is turned on, and the AC auxiliary power supply remains stopped until the control system starts and issues a start command during the day.

[0145] Through the AC auxiliary power supply control circuit provided in the example of the present disclosure, when the photovoltaic components stop working at night, the control system output terminal CTL1 can be controlled to the EN pin of the AC auxiliary power supply control chip U1 through the optocoupler D1, so that the inverter can turn off the AC auxiliary power supply after completing actions such as status detection, inverter potential induced decay PID effect repair, and inverter program update and upgrade, and the inverter enters the shutdown state, thereby reducing power consumption at night.

[0146] Referring to Figure 10, an embodiment of the present disclosure also discloses an inverter 2000, including: a memory 2100, a processor 2200, and a computer program stored on the memory 2100 and executable on the processor 2200, characterized in that when the processor 2200 executes the computer program, it implements the inverter power supply system control method as in any of the previous embodiments.

[0147] In addition, an embodiment of the present disclosure further discloses a computer-readable storage medium, in which computer-executable instructions are stored. The computer-executable instructions are used to execute the inverter power supply system control method in any of the previous embodiments.

[0148] An embodiment of the present disclosure also provides a computer program product, including a computer program or computer instructions, which are stored in a computer-readable storage medium. A processor of a computer device reads the computer program or computer instructions from the computer-readable storage medium, and the processor executes the computer program or computer instructions, so that the computer device executes the inverter power supply system control method provided in any embodiment of the present disclosure.

[0149] The system architecture and application scenarios described in the embodiments of the present disclosure are intended to more clearly illustrate the technical solutions of the embodiments of the present disclosure, and do not constitute a limitation on the technical solutions provided by the embodiments of the present disclosure. Those skilled in the art will appreciate that with the evolution of the system architecture and the emergence of new application scenarios, the technical solutions provided by the embodiments of the present disclosure are equally applicable to similar technical problems.

[0150] The above description of some embodiments of the present disclosure with reference to the accompanying drawings does not limit the scope of the present invention. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and essence of the present invention shall be within the scope of the present disclosure.

Claims

1. A control method for an inverter power supply system, the inverter power supply system comprising a DC auxiliary power supply connected to a high-voltage DC bus and an AC auxiliary power supply connected to an AC power grid, the DC auxiliary power supply and the AC auxiliary power supply powering a control system through a power coupling circuit, the method comprising: When the DC auxiliary power supply stops working and the inverter meets a preset shutdown condition, the control system outputs a first control signal to turn off the AC auxiliary power supply, and the inverter enters a shutdown state.

2. The control method of the inverter power supply system according to claim 1, wherein, The control system comprises a system control chip and an AC auxiliary power supply control circuit, the system control chip being connected to the AC auxiliary power supply through the AC auxiliary power supply control circuit; And wherein the control system outputs a first control signal to turn off the AC auxiliary power supply, comprising: The system control chip outputs the first control signal to the AC auxiliary power supply control circuit; The AC auxiliary power supply control circuit turns off the AC auxiliary power supply according to the first control signal.

3. The inverter power supply system control method according to claim 2, wherein, The AC auxiliary power supply control circuit comprises an AC auxiliary power supply control chip, and the AC auxiliary power supply control chip comprises an AC auxiliary power supply control pin; And wherein the AC auxiliary power supply control circuit turns off the AC auxiliary power supply according to the first control signal, comprising: When the first control signal is at a low level, the level of the AC auxiliary power supply control pin is pulled down to a low level, turning off the AC auxiliary power supply control chip, so that the AC auxiliary power supply stops working.

4. The inverter power supply system control method according to claim 3, wherein, The AC auxiliary power supply control circuit further comprises: A first switching tube, a first optocoupler, a second switching tube; The anode of the emitter of the first optocoupler is connected to the first output terminal of the power coupling circuit, the cathode of the emitter of the first optocoupler is connected to the first drain of the first switching tube, and the first gate of the first switching tube is connected to the second output terminal of the system control chip; The collector of the receiving end of the first optocoupler is connected to the second gate of the second switching tube, the second drain of the second switching tube is connected to the AC auxiliary power supply control pin, and the second source of the second switching tube is grounded.

5. The inverter power supply system control method according to claim 4, wherein, When the first control signal is at a low level, pulling down the level of the AC auxiliary power supply control pin to a low level, comprising: When the first control signal is output at the second output terminal and the first control signal is at a low level, the first switching tube is turned on, the first optocoupler is turned off, the collector of the receiving end outputs a low-level signal, so that the second switching tube is turned on, and the level of the AC auxiliary power supply control pin is pulled down to a low level.

6. The inverter power supply system control method according to any one of claims 1 to 5, wherein, The preset shutdown condition at least includes one of the following: Inverter status monitoring is completed, inverter potential-induced attenuation PID effect repair is completed, inverter program update and upgrade is completed.

7. The inverter power supply system control method according to any one of claims 1 to 5, wherein, The photovoltaic module of the inverter is connected to the DC auxiliary power supply through a high-voltage DC bus; before the control system outputs a control signal to turn off the AC auxiliary power supply, the method further comprises: Detecting the voltage value of the photovoltaic module; When the voltage value is greater than the first voltage threshold, start the DC auxiliary power supply and the AC auxiliary power supply, so that the DC auxiliary power supply and the AC auxiliary power supply jointly supply power to the inverter, and the inverter enters the working state; When the voltage value is greater than the second voltage threshold, the inverter performs self-checking and enters the power generation state after the self-checking; When the voltage value is less than the third voltage threshold, the DC auxiliary power supply stops working, so that the inverter is powered only by the AC auxiliary power supply, and the inverter enters the standby state; Wherein, the second voltage threshold is greater than the first voltage threshold.

8. The inverter power supply system control method according to claim 7, wherein, The step of starting the DC auxiliary power supply and the AC auxiliary power supply when the voltage value is greater than the first voltage threshold includes: When it is detected that the voltage value of the photovoltaic module of the inverter is greater than the first voltage threshold, start the DC auxiliary power supply; The DC auxiliary power supply supplies power to the control system through the power coupling circuit, so that the control system starts; The control system outputs a second control signal to control the start of the AC auxiliary power supply.

9. The inverter power supply system control method according to claim 8, wherein, The step of the control system outputting a second control signal to control the start of the AC auxiliary power supply includes: The system control chip outputs the second control signal to the AC auxiliary power supply control circuit; The AC auxiliary power supply control circuit starts the AC auxiliary power supply according to the second control signal; Wherein, the second control signal is a high-level signal.

10. The inverter power supply system control method according to claim 7, wherein, The self-checking performed by the inverter includes at least one of the following: The inverter performs light intensity detection; The inverter performs relay state detection; The inverter performs insulation resistance detection; The inverter performs DC arc detection.

11. An inverter, comprising: A memory, a processor, and a computer program stored on the memory and executable on the processor, wherein when the processor executes the computer program, it implements the inverter power supply system control method according to any one of claims 1 to 10.

12. A computer-readable storage medium storing computer-executable instructions for executing the inverter power supply system control method according to any one of claims 1 to 10.

13. A computer program product, comprising a computer program or computer instructions, wherein, The computer program or the computer instructions are stored in a computer-readable storage medium, and the processor of the computer device reads the computer program or the computer instructions from the computer-readable storage medium, and the processor executes the computer program or the computer instructions, so that the computer device executes the inverter power supply system control method according to any one of claims 1 to 10.

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